From 543b1f369576430b76f0aa7d44c4fe6f7e9785b4 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Fri, 30 Dec 2022 15:01:12 +0100
Subject: git: add zola runner to automatically build & depoly the blog

---
 roles/git/files/runner-zola/Dockerfile | 11 +++++++++++
 roles/git/files/runner-zola/webhook.sh | 36 ++++++++++++++++++++++++++++++++++
 roles/git/tasks/main.yml               | 23 +++++++++++++++++++++-
 3 files changed, 69 insertions(+), 1 deletion(-)
 create mode 100644 roles/git/files/runner-zola/Dockerfile
 create mode 100755 roles/git/files/runner-zola/webhook.sh

diff --git a/roles/git/files/runner-zola/Dockerfile b/roles/git/files/runner-zola/Dockerfile
new file mode 100644
index 0000000..be1eb6e
--- /dev/null
+++ b/roles/git/files/runner-zola/Dockerfile
@@ -0,0 +1,11 @@
+FROM alpine:latest
+
+RUN apk add --update-cache --upgrade --no-cache --purge \
+      zola git                                          \
+    && rm -rf /var/cache/apk
+
+EXPOSE 80
+WORKDIR /tmp
+
+COPY webhook.sh /
+ENTRYPOINT ["/webhook.sh"]
diff --git a/roles/git/files/runner-zola/webhook.sh b/roles/git/files/runner-zola/webhook.sh
new file mode 100755
index 0000000..6f20c8c
--- /dev/null
+++ b/roles/git/files/runner-zola/webhook.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# Simple webhook to build and deploy latest blog version.
+# The webhook allows to pass an optional ref as url path.
+#
+# Examples:
+#   curl <host>             ; Will deploy main ref
+#   curl <host>/blub        ; Will deploy blub ref
+
+while true; do
+    echo "Wait for webhook trigger ..."
+
+    # Wait until webhook is triggered and parse out optional branch info.
+    # The branch info can be passed via the url path, an example is:
+    #   GET /blub HTTP/1.1
+    REF=$(echo -e "HTTP/1.0 204 No Content\r\nConnection: close\r\n\r" | nc -l -p 80 | awk '/GET/ { print $2; }' | tr -d '/')
+    # If we got a ref use it else default to main.
+    REF=${REF:-main}
+
+    if [ ! -d blog ]; then
+        git clone https://git.memzero.de/blog
+    fi
+    git -C blog submodule init
+    git -C blog submodule update
+    git -C blog fetch --prune
+    echo "Checking out ref: $REF"
+    git -C blog checkout $REF || continue
+
+    zola --root blog build || continue
+
+    # webroot must be mounted at /www.
+    rm -rf /www/blog
+    mv blog/public /www/blog
+
+    echo "SUCCESS: Updated /www/blog"
+done
diff --git a/roles/git/tasks/main.yml b/roles/git/tasks/main.yml
index 0557615..131b971 100644
--- a/roles/git/tasks/main.yml
+++ b/roles/git/tasks/main.yml
@@ -1,11 +1,14 @@
 ---
 - name: Copy container build files
   ansible.builtin.copy:
-    src: gitolite-cgit
+    src: "{{ item }}"
     dest: "{{ DATA_ROOT }}/git"
     owner: "{{ USER }}"
     group: "{{ USER }}"
     mode: preserve
+  loop:
+    - gitolite-cgit
+    - runner-zola
 
 - name: Build gitolite cgit image
   containers.podman.podman_image:
@@ -38,3 +41,21 @@
     jump: ACCEPT
     comment: Accept gitolite SSH connections.
   become: true
+
+- name: Build zola runner image
+  containers.podman.podman_image:
+    name: runner-zola
+    path: "{{ DATA_ROOT }}/git/runner-zola"
+    force: true
+  register: runner_zola_build
+
+- name: Start zola runner
+  containers.podman.podman_container:
+    name: runner-zola
+    image: runner-zola
+    network: "{{ NETWORK }}"
+    volumes:
+      # Mount the webserver webroot to deploy the blog.
+      # Use 'z' to shared-ly relable selinux contexts.
+      - "{{ DATA_ROOT }}/nginx/www:/www:z"
+    recreate: "{{ runner_zola_build.changed }}"
-- 
cgit v1.2.3